Effect of High Temperature Exposure on Bond Properties of Steel Deformed Rebar Embedded in Self-Consolidating Concrete Containing Copper Slag as Fine Aggregate

Despite the extensive studies in the literature on using copper slag (CS) as fine aggregate within normal concrete to alleviate the thermal cracking of samples exposed to high temperatures, very limited investigations concentrated on self-consolidating concrete (SCC). Moreover, there is no precise s...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2023-12, Vol.35 (12)
Main Authors: Nabahati, Farnam, Mousavi, Seyed Sina, Dehestani, Mehdi
Format: Article
Language:English
Subjects:
Ambient temperature
Bond energy
Bond stress
Bonding strength
Building materials
Civil engineering
Concrete aggregates
Copper
Cracking (fracturing)
Damage
Deformation effects
Envelope curves
High temperature effects
Rebar
Reinforcing steels
Self-compacting concrete
Slag
Temperature
Thermal simulation
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Summary:Despite the extensive studies in the literature on using copper slag (CS) as fine aggregate within normal concrete to alleviate the thermal cracking of samples exposed to high temperatures, very limited investigations concentrated on self-consolidating concrete (SCC). Moreover, there is no precise study to determine the effect of CS on thermal damage mitigation at the rebar/SCC interface. Hence, the present study intends to experimentally determine the residual bond properties of steel rebar embedded in SCC specimens exposed to high temperatures. Accordingly, three different percentages of 35%, 70%, and 100% of normal fine aggregate replacement by CS were considered. Also, different high-temperature exposures of 350°C, 550°C, and 750°C were selected for simulating thermal damage. Bond parameters were extracted from the bond-slip envelope curves to compare the results, including average bond stress, maximum bond stress (or bond strength), residual bond stress, and bond energy. Generally, findings revealed that using CS causes an increase in bond properties in undamaged specimens at ambient temperature and that a 53.6% bond strength improvement was observed for 100% CS replacement as compared to the reference SCC mixture. However, in thermally-damaged SCC specimens, the optimal dosage of 35% was found for fine aggregate replacement by CS.
ISSN:0899-1561
1943-5533
DOI:10.1061/JMCEE7.MTENG-16062